If a Woman's Period Begins

A woman who is menstruating, or bleeding after childbirth, still enters ihram at the miqat. When Asma' bint 'Umays gave birth at Dhul-Hulayfah, the Prophet ﷺ told her: "Bathe, bind yourself with a cloth, and enter ihram."

She does everything other pilgrims do, the talbiyah, dhikr and du'a, except the tawaf, which waits until her bleeding has ended and she has made ghusl. When 'A'ishah's period began on the way to Makkah, the Prophet ﷺ told her: "Do what the pilgrim does, except that you do not circle the House until you are pure."

So she stays in ihram and waits, then completes the tawaf, the sa'i and the shortening once she is pure. If her period begins after she has finished the tawaf, she may go on to the sa'i, since the four schools do not make purity a condition of the sa'i.